Photocurable molding, impregnating and coating compositions

Claim 1

A photocurable molding, impregnating and coating composition comprising a mixture of (a) or more ethylenically unsaturated polyesters or vinyl ester resins having the characteristic group --CO--OCH 2 CHOH--CH 2 O--, (b) one or more ethylenically unsaturated copolymerizable monomeric compounds, (c) an inhibitor and (d) an UV sensitizer, with or without (e) paraffins, thermally decomposable initiators, fillers, reinforcing agents, lubricants, inert solvents, shrinkage-reducing additives and other assistants usable in unsaturated polyesters, wherein the UV sensitizer consists of one or more acylphosphine oxide compounds of the formula ##STR26## where R 1 is straight-chain or branched alkyl of 1 to 6 carbon atoms, cyclohexyl, cyclopentyl, aryl which is unsubstituted or substituted by halogen, alkyl or alkoxy, or a S-containing or N-containing five-membered or six-membered heterocyclic radical, R 2 has one of the meanings of R 1 (but R 1 and R 2 may be identical or different), or is alkoxy of 1 to 6 carbon atoms, aryloxy or aralkoxy, or R 1 or R 2 together stand for an o-phenylene-dioxy group, and R 3 is a substituted or unsubstituted straight-chain or branched alkyl of 2 to 18 carbon atoms, a cycloaliphatic radical of 3 to 10 carbon atoms, vinyl, phenyl, naphthyl or a S-, O- or N-containing five-membered or six-membered heterocyclic radical or is the group ##STR27## where R 1 and R 2 have the above meanings and X is phenylene or an aliphatic or cycloaliphatic divalent radical of 2 to 6 carbon atoms.